yes, E2 is a major factor in BPH.
Oddly, over 8 years of TRT, my PSA has been low and getting lower.
This may be helpful:
You can also take fish oil and anti-oxidants that have anti-inflammatory effects. Some BPH is partly an inflammatory response.
Ejaculation also can address some seminal vessel inflammation that can occur if seminal vessels do not get empties and seminal fluid gets rancid. Not an issue for you!